Daikin RQYQ140-180PY1 Service Manual page 226

Example of connection (R-410A Type)
a
Pipe size selection
Caution
Refer to the diagram below and select the
appropriate piping from the tables on the right.
<Single Outdoor Unit System>
Outdoor unit
Indoor unit
Piping between
refrigerant
branching kits
(Section D)
Piping between refrigerant branching
kit and indoor unit (Section E)
Piping between outdoor unit and
refrigerant branching kit (Section A)
<Multiple Outdoor Unit System>
Outdoor unit
Indoor unit
Piping between
refrigerant
branching kits
(Section D)
Piping between refrigerant
branching kit and indoor
unit (Section E)
Piping between outdoor unit
connection piping kit and
Piping between outdoor unit
refrigerant branching kit (Section A)
connection piping kit and
outdoor unit (Section C)
Piping between outdoor unit
connection piping kits (Section B)
a
217
Piping between outdoor unit (*2) and refrigerant branch kit (part A)
• Choose from the following table in accordance with the outdoor
unit system capacity type. (Note1)
Piping size (O.D.)
Outdoor capacity Suction gas size
index Standard Maximum
size size
φ15.9
Q140
φ25.4
φ19.1
Q180
φ22.2
Q280
φ28.6
φ25.4
Q360
Q460
φ28.6 φ41.3
Q500
Q540
Piping between outdoor unit multi connection piping kits (part B)
• Choose from the following table in accordance with the total
capacity of all the outdoor units connected upstream
Piping size (O.D.)
Outdoor unit
capacity type
Suction gas pipe
φ22.2
280
φ25.4
360
Piping between outdoor unit multi connection piping kit and outdoor
unit(part C)
• Choose from the following table in accordance with the capacity
type of the outdoor unit connected
Piping size (O.D.)
Outdoor capacity
index
Gas pipe
φ15.9
Q140
φ19.1
Q180
Piping between refrigerant branch kits
• Choose from the following table in accordance with the total
capacity index of all the indoor units connected below this. (part D)
• Do not let the connection piping exceed the main refrigerant piping
size.
Liquid pipe
Standard Maximum
size size
Indoor capacity index
φ12.7
φ9.5
φ15.9
φ12.7
11.2 kW ≤ x< 22.4 kW
22.4 kW ≤ x< 33.0 kW
φ15.9 φ19.1
33.0 kW ≤ x< 37.0 kW
37.0 kW ≤ x< 47.0 kW
47.0 kW ≤ x< 71.0 kW
71.0 kW ≤
Piping between refrigerant branch kit and indoor unit
(unit: mm)
• Match to the size of the connection piping on the indoor unit.
(part E)
Liquid pipe
φ9.5
Indoor
φ12.7
capacity index
Q20
Q25
Q32
Q40
(unit: mm)
Q50
Q63
Liquid pipe
Q80
φ9.5
Q100
Q125
Q200
Q250
Piping size (O.D.)
Suction gas pipe Liquid pipe
Standard Maximum Standard
size size size
φ19.1
< 11.2 kW
φ15.9
φ25.4 φ9.5
φ22.2
φ25.4 φ28.6
φ12.7
φ28.6
φ34.9 φ15.9
φ34.9 φ41.3 φ19.1
Piping size (O.D.)
Suction gas pipe Liquid pipe
Standard Maximum Standard
size size size
φ12.7 φ15.9 φ6.4
φ19.1
φ15.9
φ25.4 φ9.5
φ19.1
φ28.6
φ22.2
SiBE341001
(Unit:mm)
Maximum
size
φ12.7
φ15.9
φ19.1
φ22.2
(Unit:mm)
Maximum
size
φ9.5
φ12.7
φ15.9
Appendix